D Question 6 4 pts A bridge bearing has a rectangular shape and is made from rubber laminated with thin steel sheets (parallel to the top and bottom faces of the block). In order to cope with the sideways forces of the bridge expanding and contracting, the shear modulus of the rubber is 3.0 MPa. The bearing has a width of 60 cm, a depth of 38 cm and a total height of 37 cm. It also needs to withstand a vertical compressive force of 258 kN and must not compress more than 6 mm under this force. Calculate the minimum number of rubber layers needed to achieve this condition. Enter your answer as an integer, and because of this, there is no margin of error on this question.

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